Johnny Depp has been ordered to take a voice test before composer Stephen Sondheim will give his blessing for the actor to star in musical SWEENEY TODD. The Pirates Of The Caribbean star has performed in bands since he was 13, but the 76-year-old musical theatre legend fears his vocals may be too rock 'n' roll to play the murderous barber. A spokesman for Sondheim says, "He wants to make sure that all versions of his works are the best possible."